Helvetica Chimica Acta · 1993 · 36 citations · 9 references
Natural SciencesBiochemistryChemistryOrganic ChemistrySpectroscopySynthetic Medicinal ChemistryMagnetism Of Inorganic CompoundsRadical ReactionsBiradical CharacterGround State PropertiesOrganic Radical Spectroscopy
Abstract 3,5,3″,5″‐Tetra( tert ‐butyl)‐ p ‐terphenoquinone ( 12b ) was synthesized and characterized by its spectroscopic and X‐ray structural data. The ground state of 12b is singlet with a strong contribution of a biradical structure. Paramagnetic derivative of 12b , such as the semiquinone radical anion (12b τ ) and its O ‐protonated form, the phenoxy radical ( 18 ), were studied by ESR and ENDOR spectroscopy.
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